Apparatus and method for time dependent power spectrum analysis of physiological signals
First Claim
1. An apparatus for time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system, the apparatus comprising:
- (a) a sensor for picking up a physiological signal modulated by the autonomic nervous system;
(b) frequency selection apparatus for selecting at least one frequency inherent to said signal;
(c) a selective windowed time-frequency analysis processor for determining the power spectrum of said physiological signal within a window along said signal for said at least one frequency, said processor calculates the duration of said window as a function of said at least one frequency, thereby enabling the analysis of signals under non-steady state conditions; and
(d) output apparatus for providing information associated with the functioning of the autonomic nervous system as provided by the power spectrum of the physiological signal.
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Abstract
An apparatus for time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system. The apparatus includes a sensor for picking up a physiological signal modulated by the autonomic nervous system and a frequency selection apparatus for selecting at least one frequency inherent to the signal. The apparatus further includes a selective windowed time-frequency analysis processor for determining the power spectrum of the physiological signal within a window along the signal for the at least one frequency and an output apparatus for providing information associated with the functioning of the autonoinic nervous system as provided by the power spectrum of the physiological signal.
163 Citations
50 Claims
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1. An apparatus for time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system, the apparatus comprising:
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(a) a sensor for picking up a physiological signal modulated by the autonomic nervous system; (b) frequency selection apparatus for selecting at least one frequency inherent to said signal; (c) a selective windowed time-frequency analysis processor for determining the power spectrum of said physiological signal within a window along said signal for said at least one frequency, said processor calculates the duration of said window as a function of said at least one frequency, thereby enabling the analysis of signals under non-steady state conditions; and (d) output apparatus for providing information associated with the functioning of the autonomic nervous system as provided by the power spectrum of the physiological signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system, the method comprising the steps of:
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(a) picking up a physiological signal modulated by the autonomic nervous system; (b) selecting at least one frequency inherent to the signal; (c) determining the power spectrum of the physiological signal within a window along said signal for the at least one frequency by using a selective windowed time frequency analysis processor, wherein said processor calculates the duration of said window as a function of said at least one frequency, thereby enabling the analysis of signals under non-steady state conditions; and (d) providing information associated with the functioning of the autonomic nervous system as provided by the power spectrum of the physiological signal.
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22. An apparatus for time dependent power spectrum analysis of a physiological signal, the apparatus comprising:
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(a) a sensor for picking up a physiological signal; (b) a frequency selector electrically connected to said sensor for selecting at least one frequency inherent to said signal; (c) window generating apparatus electrically connected to said frequency selector for generating a window along said signal, the duration of said window being substantially inversely related to said at least one frequency; (d) decimation apparatus electrically connected to said sensor and said window generating apparatus for providing data points within said window; (e) spectral transform apparatus electrically connected to said decimation apparatus for determining the power spectrum of said signal within said window for said at least one frequency; and (f) output apparatus electrically connected to said spectral transform apparatus for providing information associated with time dependent power spectrum of said signal. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method of time dependent power spectrum analysis of a physiological signal, the method comprising the steps of:
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(a) picking up a physiological signal; (b) selecting at least one frequency inherent to the signal; (c) generating a window along the signal by using a window generating apparatus, said window generating apparatus calculates the duration of the window to be substantially inversely related to the at least one frequency so as to enable the analysis of signals under non-steady state conditions; (d) providing data points within the window; (e) determining the power spectrum of the signal within the window for the at least one frequency; and (f) providing information associated with time dependent power spectrum of the signal.
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38. An apparatus for time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system, the apparatus comprising:
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(a) a sensor for picking up a physiological signal modulated by the autonomic nervous system; (b) frequency selection apparatus for selecting at least one frequency inherent to said signal; (c) a selective windowed time-frequency analysis processor for determining the power spectrum of said physiological signal within a window along said signal for said at least one frequency, said window has an aperture selected from one of the following;
a rectangular aperture, a Hamming aperture, a Hanning aperture, a Blackman aperture, a Gaussian window, a Lorentzian window, a sinc window, a power of a sine window and a power of a cosine window; and(d) output apparatus for providing information associated with the functioning of the autonomic nervous system as provided by the power spectrum of the physiological signal.
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39. An apparatus for time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system, the apparatus comprising:
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(a) a sensor for picking up a physiological signal modulated by the autonomic nervous system; (b) frequency selection apparatus for selecting at least one frequency inherent to said signal; (c) a selective windowed time-frequency analysis processor for determining the power spectrum of said physiological signal within a window along said signal for said at least one frequency, said selective windowed time-frequency analysis processor comprises a Wavelet processor; and (d) output apparatus for providing information associated with the functioning of the autonomic nervous system as provided by the power spectrum of the physiological signal. - View Dependent Claims (40, 41, 42)
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43. An apparatus for time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system, the apparatus comprising:
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(a) a sensor for picking up a physiological signal modulated by the autonomic nervous system; (b) a physiological signal selector electrically connected to said sensor for selecting the type of physiological signal picked up by said sensor; (c) frequency selection apparatus for selecting at least one frequency inherent to said signal; (d) a selective windowed time-frequency analysis processor for determining the power spectrum of said physiological signal within a window along said signal for said at least one frequency; and (e) output apparatus for providing information associated with the functioning of the autonomic nervous system as provided by the power spectrum of the physiological signal.
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44. An apparatus for time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system, the apparatus comprising:
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(a) a sensor for picking up a physiological signal modulated by the autonomic nervous system; (b) frequency selection apparatus for selecting at least one frequency inherent to said signal; (c) a selective windowed time-frequency analysis processor for determining the power spectrum of said physiological signal within a window along said signal for said at least one frequency; (d) output apparatus for providing information associated with the functioning of the autonomic nervous system as provided by the power spectrum of the physiological signal; and (e) a type of perturbation selector for selecting the type of perturbation to be applied to a subject under investigation.
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45. An apparatus for time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system, the apparatus comprising:
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(a) a sensor for picking up a physiological signal modulated by the autonomic nervous system; (b) frequency selection apparatus for selecting at least one frequency inherent to said signal; (c) a selective windowed time-frequency analysis processor for determining the power spectrum of said physiological signal within a window along said signal for said at least one frequency; (d) output apparatus for providing information associated with the functioning of the autonomic nervous system as provided by the power spectrum of the physiological signal; and (e) a detrending filter deployed between said sensor and said selective windowed time-frequency analysis processor.
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46. An apparatus for time dependent power spectrum analysis of a physiological signal modulated by the autonomic nervous system, the apparatus comprising:
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(a) a sensor for picking up a physiological signal modulated by the autonomic nervous system; (b) frequency selection apparatus for selecting at least one frequency inherent to said signal; (c) a selective windowed time-frequency analysis processor for determining the power spectrum of said physiological signal within a window along said signal for said at least one frequency, said selective windowed time-frequency analysis processor comprises a selective discrete spectral transform algorithm processor; (d) a window duration selector for selecting the duration of said window; (e) output apparatus for providing information associated with the functioning of the autonomic nervous system as provided by the power spectrum of the physiological signal. - View Dependent Claims (47, 48, 49, 50)
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Specification